Electric lamp bulb



Oct. 21, 1952 E. A. HORBERG ELECTRIC LAMP BULB Filed Oct. 25, 1950 FIG. 1

FIG. 2

FIG. 3

INVENTOR ERIK ALLAN HORBERG ATTORNEY Patented Oct. 21, 1952 ELECTRIC LAMP BULB Erik Allan Hiirberg, Enskede, Sweden, assignor to Lumalampan Aktiebolag, Stockholm, Sweden, a corporation of Sweden Application October 23, 1950, Serial No. 191,669 In Sweden March 12, 1949 3 Claims.

In a common design of electric lamps one of the lead wires of the lamp is bent upwardly over the collar of the lamp socket and attached by soldering or equivalent means to the outside of the socket collar.

Especially in the case of small lamps, such an arrangement has the fault that the bentover lead wire dislocates the part of the lamp bulb which fits into the socket collar, which results in the lamp taking an inclined position in the socket. As a rule, the lamp bulb is also provided with a step above the portion intended to fit into the socket collar. This step may tend to increase the inclination of the lamp bulb in the socket collar. When putting sockets on the lamps, it is therefore necessary to make sure at all times that the lamp bulb takes the correct position in the socket and to correct the position of the lamp bulb by adjustment by hand. In order to reduce the tendency of the lamp bulb to reach an inclined position, a small notch has previously been cut into the upper edge of the socket into which the lead wire fits. This arrangement does not sufiiciently reduce the tendency to force the lamp bulb to an inclined position, and it also delays the socketing of the lamps, as the socket must be turned to the right position in order to make the lead wire fit.

This invention relates to providing a lamp bulb which will eliminate, or at least substantially reduce the risk of the lamp bulb being moved to an inclined position by the bent-over lead wire.

According to this invention, that portion of the bulb which is to be fitted into the socket collar is provided with at least three recesses placed in a ring and solely separated by quite short interspaces for receiving the bent-over lead wire in any of them. The lamp bulb may, in a known way, be provided with a step above th portion intended for fitting into the socket collar. In this design it is appropriate for the recess to extend upwardly into the step.

If the so-called neck of the lamp bulb is provided with three recesses such neck will thus rest with three supporting studs in the socket collar, and it will be very easy to quickly find a recess in the neck in which to pass the lead wire. Attention is called to a special advantage. If the circumference, along which the supporting studs are placed, very closely coincides with the socket collar, the neck portion of the lamp bulb can be slid into the socket in a tight fit, which makes the work of socketing easy and simple.

This invention is explained further by an example of design shown in the accompanying drawing, in which:

Fig. 1 is a longitudinal section through a miniature incandescent lamp;

Fig. 2 is a cross section through the lamp in that portion, where the lamp is attached in the socket collar; and

Fig. 3 shows the lower part of a bulb for the lamp.

Bulb 8 of the lamp has a neck portion [8, above which is arranged a shoulder or step l0. End 54 of the bulb is closed by melting and drawing together the end lower portion ll situated below the neck portion l8 of the lamp bulb, and into this closed end portion the lead wires 1 and I5 of the lamp are sealed. The lead wires are surrounded by a pearl foot 9, and into the bottom is fused a supporting Wire 5, which at the top is shaped to form an eye 6. The spiral filament 'l is mounted as an upside down V, and the ends are welded to the lead wires and the top inserted through eye 6. The neck portion I8 is provided with three peripherally spaced and relatively narrow supporting projections I2, separated by peripherally wider recessed portions 3. These recesed portions extend at least in part into the step or shoulder ID, as indicated at 4 in Fig. 3. The supporting projections l2 engage the collar portion H of socket l3 when the parts are assembled and a plurality of wide channels is thus provided between these portions and the collar. One of the lead wires l extends upwardly through one of said channels to the exterior of the lamp, the external end being bent over the top edge of the collar and attached to the outside thereof by solder 2. The other lead wire 15 is connected to the bottom contact l6 of socket 13.

While on preferred example of construction has been shown by way of illustration, it will be evident that changes in the specific design illustrated may be made without departing from the principles of the invention, the scope of which includes all structures falling Within the terms of the appended claims.

What I claim is:

1. An electric lamp comprising a glass bulb having a neck portion and lead wires extending from a lower portion of said bulb, said neck being formed to provide at least three peripherally spaced and peripherally narrow projections separated by peripherally extending recessed portions of materially greater peripheral extent than said projections, said recesses extending axially for the full width of said neck portion, and a socket having a collar at its open end receiving said bulb with said projections in contact therewith to locate the bulb in the socket, one of said lead wires extending from said lower portion of the bulb upwardly through one of the channels formed betweensaidcollar and the recessed portions of said neck and being soldered externally to said collar.

2. A lamp as defined in claim 1 in which said collar is cylindrical and said projections are a tight sliding fit therein.

3. A lamp as defined in claim 1 in which the bulb is provided with a shoulder or step'above the neck portion providing a stop for engaging the upper edge of the collar, and in which said recessed portions of the neck extend at-least-in part axially into said step to provide openings between the upper edge of the collar and the wall of the bulb for said one of said lead wires.

ERIK ALLAN H'O'RBERG.

5 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 10 Number Name Date 1,650,289 McGinley Nov. 22, 1927 7 1,813,572 Gustin July 7, 1931 2,031,746 Thomas Feb. 25, 1936 2,077,199 Asmussen Apr. 13, 1937 15 FOREIGN PATENTS Number Country Date 609,031 Germany Feb. 6, 1935 

